> is the qmail-smtpd daemon running ? if yes, what does it do at the time of
> the problem ? how many qmail-smtpd processes are running at the same time
> (try various options with ps command, and/or top)
>
> is it listening on the smtp port ? (try netstat -nap)
>
> is really not responding (try telnet yourmachine on port 25, then begin
> typing smtp protocol commands and see the result)
>
> activate a network trace to try and see whether it's a network problem
> (with tcpdump -w tracefile tcp port 25 or something like that)
qmail-smtp is running and if we see with netstat smtp port is listening.
the smtp work properly, but in few days smtp have a problem with a long
time of responding
and if we restart the mail server the smtp can work with no problem and
the problem come again in 1 day or 2 days.
it happen again and again , so now i just can do is restart the qmail to
fix the problem.
i try to fix it, with add -H parameter in qmail-smtp run script because i
guess it have a problem with big queue in server.
this script i use in smtp-run like this:
#!/bin/sh
QMAILDUID=`id -u qmaild`
NOFILESGID=`id -g qmaild`
MAXSMTPD=`cat /var/qmail/control/concurrencyincoming`
LOCAL=`head -1 /var/qmail/control/me`
if [ -z "$QMAILDUID" -o -z "$NOFILESGID" -o -z "$MAXSMTPD" -o -z
"$LOCAL" ]; then
echo QMAILDUID, NOFILESGID, MAXSMTPD, or LOCAL is unset in
echo /var/qmail/supervise/qmail-smtpd/run
exit 1
fi
if [ ! -f /var/qmail/control/rcpthosts ]; then
echo "No /var/qmail/control/rcpthosts!"
echo "Refusing to start SMTP listener because it'll create an open relay"
exit 1
fi
exec /usr/local/bin/softlimit -m 3000000 \
/usr/local/bin/tcpserver -v -H -R -l "$LOCAL"
-x /etc/tcp.smtp.cdb -c "$MAXSMTPD" \
-u "$QMAILDUID" -g "$NOFILESGID" 0 smtp /var/qmail/bin/qmail-smtpd 2>&1
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